2123161 has 2 divisors, whose sum is σ = 2123162. Its totient is φ = 2123160.

The previous prime is 2123141. The next prime is 2123167. The reversal of 2123161 is 1613212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2085136 + 38025 = 1444^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123161 - 2⁵ = 2123129 is a prime.

It is not a weakly prime, because it can be changed into another prime (2123167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061580 + 1061581.

It is an arithmetic number, because the mean of its divisors is an integer number (1061581).

2^2123161 is an apocalyptic number.

It is an amenable number.

2123161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123161 is an equidigital number, since it uses as much as digits as its factorization.

2123161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 2123161 is about 1457.1070653868. The cubic root of 2123161 is about 128.5269818736.

Adding to 2123161 its reverse (1613212), we get a palindrome (3736373).

The spelling of 2123161 in words is "two million, one hundred twenty-three thousand, one hundred sixty-one".